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Nacre toughening due to cooperative plastic deformation of stacks of co-oriented aragonite platelets
Communications Materials Pub Date : 2020-10-28 , DOI: 10.1038/s43246-020-00078-y
Hyun-Chae Loh , Thibaut Divoux , Bernd Gludovatz , Pupa U. P. A. Gilbert , Robert O. Ritchie , Franz-Josef Ulm , Admir Masic

Nacre’s structure-property relationships have been a source of inspiration for designing advanced functional materials with both high strength and toughness. These outstanding mechanical properties have been mostly attributed to the interplay between aragonite platelets and organic matrices in the typical brick-and-mortar structure. Here, we show that crystallographically co-oriented stacks of aragonite platelets, in both columnar and sheet nacre, define another hierarchical level that contributes to the toughening of nacre. By correlating piezo-Raman and micro-indentation results, we quantify the residual strain energy associated with strain hardening capacity. Our findings suggest that the aragonite stacks, with characteristic dimensions of around 20 µm, effectively store energy through cooperative plastic deformation. The existence of a larger length scale beyond the brick-and-mortar structure offers an opportunity for a more efficient implementation of biomimetic design.



中文翻译:

由于共取向文石片叠堆的协同塑性变形,使珍珠层增韧

Nacre的结构属性关系一直是设计具有高强度和韧性的高级功能材料的灵感来源。这些杰出的机械性能主要归因于在典型的砖瓦结构中文石血小板与有机基质之间的相互作用。在这里,我们显示了在柱状和片状珍珠质中文石片晶的晶体共取向堆叠,定义了另一个有助于珍珠质增韧的等级。通过关联压电拉曼和微观压痕结果,我们量化了与应变硬化能力相关的残余应变能。我们的发现表明,特征尺寸约为20 µm的文石叠层可通过协同塑性变形有效地存储能量。

更新日期:2020-10-29
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